The document details the definition of a declarative workflow model for orchestrating event-driven, serverless applications under the CNCF Serverless Working Group. It outlines the creation of a vendor-neutral, platform-independent model that facilitates portability and includes features such as stateful and stateless orchestration, event consumption, and error handling. Additional resources and integration methods are provided, along with links to relevant tools and communities.

1. Serverless
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@tsurdilo

2. Define a declarative workflow
model that orchestrates event-driven,
serverless applications.
CNCF Serverless WG Sandbox Project
Vendor-neutral
Platform-independent
Apache License 2.0

3. Provide a common
workflow
model definition.
Common model
allows easier portability
across
platforms/containers.
Common model
can drive common:
*libraries
*tooling
*infrastructure
Describe both stateful
and stateless
orchestration.

4. TCK
<code>
SDK
<code>
JSON SCHEMA
{ … }
RUNTIME IMPL
conforms to…uses…
EXT
{ … }
KPIs
Sim
Tra
cing
S
p
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c
R
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t
i
m
e
s

5. JSON/YAML
Runtime Runtime Runtime
Specification

8. Workflow
state
state
state
state

9. Workflow Workflow Workflow

10. Trigger 1
Trigger 2
Trigger 3
SinkBinding 1
SinkBinding 2
SinkBinding 3
… …
Service
Discovery
Services /
Deployments

11. “Container images”“Cloud services”
Define used services

12. Correlation rulesDeclarative types
cloudevents
Define consumed/produced events

13. Define services execution
Function reference Event-triggered

14. Define control-flow logic
A
A B
Sequence
A
A A
Data/Event based
transition
A
Data-based
looping
A B C
Parallel Exec Error handling
(and much more … )

15. Broker
Knative Resource
Workflow Service
Trigger1
Trigger2
Trigger3
Serving
Service
(http)
Workflow Workflow Workflow
Example - Event-triggered workflow exec

16. GitHub: https://github.com/serverlessworkflow
Web: http://serverlessworkflow.io
Slack: https://slack.cncf.io/ #serverless-workflow
Meetings: https://www.cncf.io/community/calendar/

17. Rest
Integration
K
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F
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Serverless
Workflow
Human Task
Service
Rule
Service
Kogitcloudevents
New Orders Process Orders
Messaging
Custom UI
http://orders-demo-serverless-demos.apps.kogito.automation.rhmw.io/

18. Questions?